What did the captain of the Dei Gratia decide to do when there was no response from anyone on the Mary Celeste?

He placed a call to the harbormaster in New York to find out more about the voyage of the Mary Celeste.

He suspected that the Mary Celeste's sailors had overthrown their captain and readied his own ship for battle.

He brought the Dei Gratia close enough to the Mary Celeste that he could board the ship himself.

He ordered three men to take a small boat over to the Mary Celeste and find out what was wrong.